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Vehicle steering device

Active Publication Date: 2005-11-24
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The present invention has been made to solve the above problems, and an object of the invention is to smoothly control the driving for the operation-side motor.
[0011] If a rotation angle detecting means is provided at the motor shaft of the operation-side motor, the rotation speed of the rotation operating member is increased and transmitted to the motor shaft of the operation-side motor by the speed reduction mechanism provided between the steering shaft and the motor shaft. Therefore, high resolution absolute operation angle signals can be obtained without providing an angle detecting means having high resolution, and the driving of the operation-side motor can be controlled smoothly.
[0013] In order to compute the absolute rotation angle of the operation-side motor, a reference rotation angle as well as the relative rotation angle is required. However, the absolute operation angle of the rotation operating member is used as the reference operation angle without providing a reference rotation angle detecting means. Therefore, the absolute rotation angle detecting means can be omitted, and the cost of the vehicle steering device can be decreased.
[0015] It is not necessary to provide a separate absolute operation angle means that detects the absolute operation angle of the rotation operating member. Therefore, the cost of the vehicle steering device can be decreased.
[0018] Various control means that processes different types of signals according to vehicle manufactures or vehicle types etc. can be provided to vehicles. In the related art, respective vehicle steering devices fit to control means are manufactured by different vehicle steering device manufacturers. In this case, the manufacturing line becomes complicated, and the cost of the vehicle steering device becomes high. Contrary to this, when a signal converting means that converts the operation angle signals outputted from the operation angle detecting means into signals of a type that the control means requires, and then transmits them to the control means, and converts the driving signals for the operation-side motor outputted from the control means into signals of a type that the operation-side motor requires, and then transmits them to the operation-side motor, the operation angle detecting means, the operation-side motor and the control means can be shared. Therefore, the vehicle steering cost can be decreased.
[0019] According to the aspect of the present invention, when the motor rotation angle detecting means is provided at the motor shaft of the operation-side motor, the rotation speed of the rotation operating member is increased by the speed reduction mechanism provided between the steering shaft and the motor shaft, and then transmitted to the motor shaft of the operation-side motor. Therefore, high resolution absolute operation angle signals can be obtained without providing an angle detecting means having high resolution, and the driving of the operation-side motor can be controlled smoothly.

Problems solved by technology

However, the detecting means having high resolution enough to perform smooth driving control usually has a high price or a low durability, therefore, it is difficult to control the driving of the operation-side motor smoothly.

Method used

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Experimental program
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first embodiment

[0027] As can be apparent from the comparison between FIG. 1 and FIG. 6, the vehicle steering device further includes a motor rotation angle detecting means 20 that detects the motor rotation angle of an operation-side motor 4 and an absolute angle computing means 21 that computes an absolute motor rotation angle signal θa for the operation-side motor 4 based on a motor rotation angle signal θr of the operation-side motor 4 outputted from the motor rotation angle detecting means 20 and an absolute operation angle signal θ1 of a rotation operating member 2 outputted from an absolute operation angle detecting means 3 comparing with a vehicle steering device in the related art shown in FIG. 6.

[0028] The other parts except the above are the same as those of the vehicle steering device in the related art shown in FIG. 6, that is, the reference numeral 1 represents a steering shaft, the reference numeral 2 represents a rotation operating member, the reference numeral 3 represents an abso...

third embodiment

[0037]FIG. 4 shows the structure of a vehicle steering device according to a The vehicle steering device includes a steering shaft 1, a rotation operating member 2, a combined rotation angle detecting means and an absolute operation angle detecting means 50, an operation-side motor 4, a speed reduction mechanism 5, a steering member 6, a steering shaft of an axle 7, a steering-side motor 8, a steering angle detecting means 9 and a control means 10. The steering member 6 is constituted with a pinion gear 11 fixed to the steering shaft 7, a rack shaft 12 having a rack gear engaging with the pinion gear 11 and a link mechanism 14 having an axle 13 driven by the rack shaft 12.

[0038] The steering device of the embodiment is characterized in that the motor rotation angle detecting means also functions as an absolute operation angle detecting means. In addition, as the combined motor operation angle detecting means and absolute operation angle detecting means 50, a digital encoder, an ana...

fourth embodiment

[0041] Next, a vehicle steering device according to the present invention will be described with reference to FIG. 5.

[0042] As shown in FIG. 5, the vehicle steering device is characterized by having a signal converting means between the combined motor operation angle detecting means and absolute operation angle detecting means 50 and the operation-side motor 4, and the control means 10, which converts the absolute operation angle signals θ1 outputted from the combined motor operation angle detecting means and absolute operation angle detecting means 50 into the absolute operation angle signals θ1′ of a type that the control means 10 requires, and then transmits it to the control means 10, and converts the driving signals M1′ for the operation-side motor 4 outputted from the control means 10 into the driving signals M1 of a type that the operation-side motor 4 requires, and then transmits them to the operation-side motor 4.

[0043] For example, when a device that outputs digital signa...

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PUM

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Abstract

A vehicle steering device includes a steering shaft; a rotation operating member of the steering shaft; an operation-side motor that supplies an operating reaction force to the rotation operating member; a steering member; a steering-side motor that supplies an operating reaction force to the steering member; a steering angle detecting means that detects a steering angle; and a control means, an absolute angle detecting means is provided at the steering shaft, and a motor rotation angle detecting means is provided at a motor shaft of the operation-side motor.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a vehicle steering device of a by-wire method, and more particularly, to means that makes smooth the control of driving for an operation-side motor, which supplies an operating reaction force to a rotation operating member. [0003] 2. Description of the Related Art [0004] In the related art, a vehicle steering device of a mechanical method in which a steering shaft is connected with a steering member via a mechanical power transmission mechanism, has been used as a vehicle steering device. However, in recent years, a vehicle steering device of the by-wire method is proposed, which converts the rotation state of a steering shaft into electric signals, and controls the driving of a steering-side motor provided at a steering member based on the electric signals, and controls the driving of an operation-side motor that supplies an operating reaction force to a rotation operating member of...

Claims

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Application Information

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IPC IPC(8): B62D5/00B62D5/04B62D6/00B62D15/02
CPCB62D5/006B62D15/0245B62D15/0235B62D15/0215
Inventor FUKUSHIMA, NORIYUKITAMEGAI, TAIGA
Owner ALPS ALPINE CO LTD
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